Tool Head Structure

ABSTRACT

A tool head structure is used to screw a general screw or screw a damaged screw and comprises two cutting edges located at the center of the front end thereof. Between the two cutting edges is formed a ridge line, at the central axis of the tool head structure is formed a chisel point, and behind the two cutting edges are formed two concave flank portions, and each flank portion is correspondingly linked up with the concave engaging portion. By such arrangements, the tool head structure of the present invention can solve the problem of easy slipping and being unable to remove the damaged screw.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a tool head structure which is used to screw the general screw and screw the damaged screw and further can directly drill a hole on the working surface.

2. Description of the Prior Art

Conventionally, when using the tool heads (such as: slot screwdrivers, cross screwdrivers or star screwdrivers) to screw various screws, it often causes the following problems:

1. The screw was often screwed in an embedded manner to obtain a smooth and nice looking working surface, but the corresponding embedding working procedure of the screw head is troublesome, the operator must replace the tool head with drill bit to machine an embedding recess, and then replace the tool head again to screw the screws, thus greatly increasing the cost.

2. The head portion of the screw is often damaged by a damaged screwdriver head, and the damaged head of the screw will cause the screw unable to continue the screwing operation, so the operator must remove the damaged screw as soon as possible, thus reducing the whole work efficiency.

3. During a general screwing operation, the unbalanced force applied by the operator and the poor contact angle between the screwing tool and the screw often cause the screw head to be damaged, or a slippage during operation causes the unexpected injuries, thus not only causing the screw unable to continue the screwing operation, but also causing the severe problem of injury.

In order to solve a part of the abovementioned problems, as shown in FIG. 1, the tool head 10 is mounted with a drill cone 11 at the center thereof, and the protruding driving portion of the tool head 10 is formed with a blade 101. Moreover, four claw portions 12 are extended from one end of the drill cone 11, and on the front edge of each claw portion 12 is formed a cuffing edge 121. By such arrangements, this conventional structure can perform both the drilling operation and the screw driving operation. The damaged screw can be removed by engaging the claw portions 12 of the drill cone 11 in the screwing recess of the screw. However, the abovementioned structure still has the following problems:

1. The end portion of the drill cone 11 is extended to form four claw portions 12, so there is not a key ridge line of a general drill, but the four angle points or four equally divided cross bevel edge. Hence, this drill cone 11 has a poor grasping ability, thus often skidding on the surface of the machining object during an electric drive operation.

2. The engagement of the claw portions 12 of the drill cone 11 with the screwing recess of the damaged screw makes the claw portions 12 grasp the inner of the screwing recess of the screw, but the four claw portion 12 with cutting edges 121 doesn't have the chisel point which is the most important during the drilling operation, so the hole drilling ability of this drill cone 11 is relatively poor.

3. The end portion of the drill cone 11 is extended to form four claw portions 12, and a special machining method is required to form the four cutting edges 121 of different directions and angles, hence the working procedure is complicated and the machining difficult is relatively high.

In order to solve the abovementioned relevant problems, based on the accumulative research technology and experience in the field of the screwdriver and the screw tool, from the angle of improving the effect of making a hole and simplifying the working procedure, the applicant of the present invention has developed a tool head structure for screwing the damaged screw.

The present invention has arisen to mitigate and/or obviate the afore-described disadvantages.

SUMMARY OF THE INVENTION

The primary objective of the present invention is to provide a tool head structure which can easily engage with the screw and is unlikely to skid.

In order to achieve the abovementioned objective, the tool head structure comprises two cutting edges located at the center of the front end thereof. Between the two cutting edges is formed a ridge line, at the central axis of the tool head structure is formed a chisel point. By such arrangements, the tool head structure of the present invention can solve the problems of easy slipping and being unable to screw the damaged screw in.

The second objective of the present invention is to provide a tool head structure which can directly drill a hole on the working surface.

In order to achieve the abovementioned objective, at the center of the front end of the tool head structure are formed two cutting edges, and between the two cutting edges is formed a ridge line, on the ridge line is formed a chisel point located correspondingly to the central axis of the tool head structure. By such arrangements, the tool head structure of the present invention can directly drill a hole on the working surface.

It is to be noted that, the tool head structure of the present invention comprises two cutting edges at the center of the front end thereof, a ridge line and a central chisel point, and a plurality of protruding driving portions which are shaped correspondingly to the screwing recess of the screw and formed with scraping surfaces. Moreover, the cutting direction of the scraping surface is the same as the screwing direction of the screw. By such arrangements, the tool head structure of the present invention can not only effectively drive the damaged screw to screw in and solve the problem of being unable to remove the damaged screw, but also effectively drill a hole on the working surface for an accommodation of a screw which has been screwed in.

At last, behind the two cuffing edges are formed two flank portions, and each flank portion is correspondingly linked up with the concave engaging portions. By such arrangements, the powder caused during shoveling the tool head structure into bottom of the screwing recess can be quickly discharged from the flank portion linked up with the concave engaging portion. Hence, the tool head structure of the present invention can smoothly discharge the caused powder.

Besides the abovementioned relevant technology, the key of the tool head structure of the present invention is to form two cuffing edges at the front end center thereof, but if adopting three or more than three cutting edges, the tool head structure of the present invention cannot be formed with a ridge line and a central chisel point. Hence, only the design with two cutting edges is within the scope of the present invention, and the tool head structure having two cutting edges, a ridge line, a central chisel point, a plurality of protruding driving portions and engaging portions is protected by the technology of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view of a conventional tool head;

FIG. 2 is a perspective view of a tool head structure in accordance with the present invention;

FIG. 3 shows one end of the tool head structure in accordance with the present invention;

FIG. 4 is a cross sectional view in accordance with the present invention of showing the tool head structure is being screwing a screw;

FIG. 5 is a cross sectional view in accordance with the present invention of showing the tool head structure is shoveled into a damaged screw;

FIG. 6 shows the tool head structure in accordance with the present invention is drilling a hole; and

FIG. 7 is a perspective view of another tool head structure in accordance with the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention will be clearer from the following description when viewed together with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment in accordance with the present invention.

Referring to FIGS. 2-4, a tool head structure 20 in accordance with the present invention is integrally formed. One end of the tool head structure 20 is in the form of a hexagonal column for assembling with the relevant tool, and the other end of the tool head structure 20 is equally formed with four protruding driving portions 21 shaped correspondingly to the cross-shaped screwing recess 31 of the screw 30. Between each two adjacent protruding driving portions 21 is formed a concave engaging portion 22. The tool head structure 20 is characterized in that:

Two cutting edges 23 are formed at the convergence center of the protruding driving portions 21 and the engaging portions 22. The two cutting edges 23 are parallel to each other in opposite directions, and between the two cutting edges 23 is formed a ridge line 24. The ridge line 24 includes a protruding chisel point 241, and two concave flank portions 231 are formed behind the two cutting edges 23. Furthermore, each flank portion 231 is correspondingly linked up with a concave engaging portion 22.

Additionally, each protruding driving portion 21 of the tool head structure 20 is formed with a scraping surface 211, and the cutting direction of the scraping surface 211 is the same as the screwing direction of the screw 30, so as to effectively perform the drilling operation or the operation of driving the damaged screw, thus solving the problem that the damaged screw is unable to use.

For a better understanding of the present invention, its operation and function, further reference should be made to FIG. 5:

When the screw 30 with damaged screwing recess 31 is screwed, the protruding driving portions 21 and the concave engaging portions 22 of the tool head structure of the same size are used to engage in the screwing recess 31 of the damaged screw 30. Because each protruding driving portion 21 of the tool head structure 20 is formed with a scraping surface 211, and the cutting direction of the scraping surface 211 is the same as the screwing direction of the screw 30, the protruding driving portions 21 of the present invention can adequately engage with the undamaged part of the screwing recess 31.

The key point is that, at the convergence center of the protruding driving portions 21 are formed two opposite parallel cutting edges 23, between the two cutting edges 23 is formed a ridge line 24, on the ridge line 24 is formed a protruding chisel point 241 located correspondingly to the central axis of the tool head structure 20, so when the screw 30 with damaged screw 31 is screwed, the two cutting edges 23 of the present invention can utilize the ridge line 24 and the protruding chisel point 241 to quickly bite the bottom surface of the screwing recess 31, thus effectively offering the functions of preventing the slippage, increasing the engaging effect and screwing the damaged screw.

It is to be noted that, the interlaced cutting operation makes the engagement much steadier but it also produces the cutting powder. In order to solve the cutting powder problem, the tool head structure 20 of the present invention is formed with two concave flank portions 231 behind the two cutting edges 23, and each flank portion 231 is correspondingly linked up with the concave engaging portion 22. By such arrangements, when the two cutting edges 23 shovel into the bottom of the screwing recess 31 of the screw 30, the powder caused by shoveling can be quickly discharged through the path defined by the flank portion 231 linked up with the concave engaging portion 22. Hence, the powder caused by shoveling of the present invention can be smoothly discharged.

Further referring to FIG. 6, because at the convergence center of the protruding driving portions 21 and the concave engaging portions 22 are formed two opposite parallel cutting edges 23, between the two cutting edges 23 is formed a ridge line 24, on the ridge line 24 is formed a protruding chisel point 241 located correspondingly to the central axis of the tool head structure 20, and two concave flank portions 231 are formed behind the two cutting edges 23 for performing the powder discharging operation, the tool head structure of the present invention can be drilled into a general machining surface 40 (such as: a board). By cooperating with the scraping surface formed on the protruding driving portion 21 of the tool head structure 20, since the cutting direction of the scraping surface 211 is the same as the screwing direction of the screw 30, with the abovementioned design, the tool head structure of the present invention can effectively perform the drilling operation, thus solving the problem of being unable to drill a hole.

At last referring to FIG. 7 of showing another tool head structure 20 with different protruding driving portions 21 and concave engaging portions 22, at the root of each engaging portion 22 is disposed a trigonal protruding block 50 to exert the same effect of the present invention.

To summarize, as compared to the conventional structure, the tool head structure of the present invention has a much greater grasping force, is difficult to skid again, and has increased the function of being able to screw the damaged screw.

While we have shown and described various embodiments in accordance with the present invention, it is clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention. 

1. A tool head structure comprising a plurality of protruding driving portions and concave engaging portions shaped correspondingly to a screwing recess of a screw at a front end thereof, characterized in that: at a convergence center of the protruding driving portions and the concave engaging portions are formed two cutting edges, and between the two cutting edges is formed a ridge line, on the ridge line is formed a chisel point located correspondingly to a central axis of the tool head structure, and behind the two cutting edges are formed two concave flank portions, each flank portion is correspondingly linked up with the concave engaging portion.
 2. The tool head structure as claimed in claim 1, wherein each protruding driving portion of the tool head structure is formed a scraping surface, and a cutting direction of the scraping surface is the same as a screwing direction of the screw.
 3. The tool head structure as claimed in claim 1, wherein the tool head structure is integrally formed, and one end of the tool head structure opposite the chisel point is in the form of a hexagonal column for assembling with relevant tools.
 4. The tool head structure as claimed in claim 1, wherein the front end of the tool head structure is shaped correspondingly to a cross-shaped screwing recess of the screw and equally formed with four protruding driving portions.
 5. The tool head structure as claimed in claim 1, wherein the front end of the tool head structure is shaped correspondingly to a slot-shaped screwing recess of the screw and equally formed with two protruding driving portions. 